I have tried connecting the saving the image to the database, but it fails. i have used the following code for updating the database with the image data:
Qt Code: 
  1. QScreenShot::QScreenShot(QWidget *parent) :
  2.     QDialog(parent),
  3.     ui(new Ui::QScreenShot)
  4. {
  5.      ui->setupUi(this);
  6.      c=0;
  7.      bool ok=false;
  8.      QDateTime dateTime = QDateTime::currentDateTime();
  9.      QString dateTimeString = dateTime.toString();
  10.  
  11.      QDir().mkdir("D:\\QtImages\\");
  12.      QDir().setCurrent("D:\\QtImages\\");
  13.      QDir().mkdir("ScreenShots");
  14.      QDir().setCurrent("ScreenShots");
  15.      QDir().mkdir(dateTimeString);
  16.  
  17.      QMessageBox::warning(NULL,"DriveList",dateTimeString,QMessageBox::Ok);
  18.  
  19.      QStringList list=QSqlDatabase::drivers();
  20.      QString driveList;
  21.      for(int i=0;i<list.length();i++)
  22.      {
  23.          driveList += list[i];
  24.      }
  25.        //QMessageBox::warning(NULL,"DriveList",driveList,QMessageBox::Ok);
  26.      QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
  27.      db = QSqlDatabase::addDatabase("QODBC");
  28.      db.setDatabaseName("DRIVER={MYSQL ODBC 3.51 Driver};FIL={MYSQL};DBQ=screengrabber");
  29.      db.setHostName("localhost");
  30.      db.setConnectOptions("CLIENT_ODBC");
  31.      //db.setDatabaseName("screengrabber");
  32.      db.setUserName("root");
  33.      db.setPassword("1");
  34.      ok = db.open();
  35.  
  36.      for(;;)
  37.      {
  38.  
  39.             originalPixmap =QPixmap();
  40.             originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
  41.             QString strfname;
  42.             strfname.sprintf("%d",c);
  43.             originalPixmap.save("D:\\image"+strfname+".jpeg","jpeg");
  44.             c++;
  45.             char Data;
  46.             QFile file("D:\\image"+strfname+".jpeg");
  47.             file.open(QIODevice::ReadOnly);
  48.             file.seek(0);
  50.             buf=file.read(250000);
  51.             QSqlQuery query;
  52.             query.prepare("INSERT INTO log VALUES('grab_date='2011-04-26 15:55:09',ip_address='172.16.0.51',image=:val');");
  53.             query.bindValue ( ":val", buf);
  54.             QString strquery;
  55.             strquery = "INSERT INTO log (grab_date,ip_address,image) VALUES ( '";
  56.             strquery += '2011-04-26 15:55:09';
  57.             strquery += "' , '";
  58.             strquery += '172.16.0.51';
  59.             strquery += "' , ";
  60.             strquery += buf;
  61.             strquery += " );";
  62.  
  63.           //QMessageBox::warning(NULL,"DriveList",strquery,QMessageBox::Ok);
  64.  
  65.             QSqlQuery insertQuery( strquery, db);
  66.             bool done = insertQuery.exec();
  67.  
  68.             QFile newfile("D:\\img.txt");
  69.             newfile.open(QIODevice::WriteOnly);
  70.             newfile.write(buf);
  71.  
  72.             int iSecret, iRandom;
  73.             iSecret = rand() % 20 + 1;
  74.             iRandom=iSecret*60000;
  75.  
  76.             QMutex mutex;
  77.             mutex.lock();
  78.             QWaitCondition waitCondition;
  79.             waitCondition.wait(&mutex, iRandom);
  80.             mutex.unlock();
  81.  
  82.     }
  83.  
  84. }
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